Adding-machine



A. A. HORTON. ADDING MACHINE v AfPLICATION FILED AUGJaf-lglfi.

Patented July 8,1919.

WITNESSES AY'A. HORTON. ADDING MACHINE. APPLICATION FILED AUG. Ii I916.

- Patented July 8, 1919. i

ZSHEETS-SHEET 2.

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ATTORNEYS tional series.

UNITED STATES PATENT OFFICE.

ALLEN A. HORTON, OF HIGHLAND PARK, MICHIGAN, ASSIGNOR TO BURROUGHS ADDING MACHINE COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

To aZZ whom it may concern Be it known that I, ALLEN A. HoR'roN, a

citizen of the United States, residing at being shown at normal; Fig. 2 is a similar Highland Park, in the county of VVay'ne and State of Michigan, have invented certain new and useful Improvements in Adding Machines, of which the following is a specification. The present invention relatesto' improvements in so-called indexing means for determining the movements of actuating elements of adding machines of that type in which such elements are directly driven by keys, and means for preventing simultaneous depression of keys ofthe same denominaventionin twodifferent forms as applied to.

. degrees of movement to such lever. In carrytaneous depression of two keys.

here shownI arrange a for each row of keys,

"is possessed o'f'nove ty such a machine as; that-illustratedin 'my prior Patent 1,156,600, issued" Oct ober"12, 1915, thou'gh'it is of courseto beunderstood that the invention In that machine,

operating-keys are arranged in several denominational rows running from front to rear, and the severalkeys ofany one row operate upon an actuating element somecolumnactuat0r which from its pivot, thereby. imparting different ing out my present inventionin both forms series of stop devices such stop devices be ing in the. form of swinging plates arranged in tandem and collectively displacea'ble upon depression of any key, the limited range of displacement being such as to prohibit-simul- This of itself is a well-known expedient 1n the art but I cause such stop devices to additionally function as means for accomplishing the socalled indexing, or, in other words, definitely measuring the movement of the actuator to correspond with the key action. I believe such a combination to be novel and I also believe that m indexing arrangement aside from its com- ,bination with means for preventing simultaneous depression of keys.

In the drawings which accompany "and form part of this specification Figure 1 rep- Specification of Letters Patent. Application filed August 1, 1916. Serial No. 112,510.

.I have shownmy present inp is not necessarily limited to its use'an connection with that particular construction of machine.

.as in others of the same general type, the

ADDING-MACHINE Patented July 8, 1919.

resents a sectional left-side elevation of a' machine embodying my invention in one of the two forms above referred to, all parts though somewhat condensed and abbreviated viewfin which the effect of depressing a key is illustrated; Fig. 3 is a vertical cross-sec tionon the line '33 of Fig. 1; Fig. 4l-. is .a

perspective view of one of the stop devices;

spective view of one of the stop devices.

No detailed description of the machine proper is necessary, in view of the disclosure afforded by my aforesaid patent, and I have here applied'to correspondingparts the same reference characters. Thus the reference letter A designates the actuating lever or 'column-actuator, B the trlangular lever which carries its fulcrum, D a link connecting said triangularlever with gear segment E which drives the registering mechanism atthe front of the machine. A" designates a link whichconnects-the forward end of the lever A with a leg of the link D. F designates the numbered keys which operate upon the lever-A at different distances from its fulcrum or pivot.

strong spring G upholds the lever A. All

- of the parts just enumerated will he found in both sets of figures of the accompanying drawings. 7

Referring now more particularly to the form ofconstruction illustrated in Figs- 1 to 5, the reference numeral 2 designates a series of pendent shouldered plates arranged at the end of the row passing down by the end stop plate. The key stems are formed with-somewhat elongated laterally projec't so coi'vperating The shoul- The keys are normallyupheld by springs as usual and a relatively -dered formation of the plate is such that intermediate key stem lugs occupy spaces between successive pairs of plates and the lugs of the end keys 1 and 9) stand respectively of them and will set up a locked relationship between the plates and all the other keys which will prevent depression of any one of them while the key in action is out of normal.

In carrying out my invention in the form shown in these particular figures of the drawings I make each stop plate in yoke form as best illustrated in Fig.4 and I provide a leg 2 thereof whichwill serveas a means for definitely limiting the initial stroke of the lever A as caused by depression of the key associated with that particular stop plate. In this connection I employ a long arm or lever 1 which is pivoted at the rear upon a frame cross rod 5 and extends forward to a point just in rear of the gear segment E. It is held in the proper vertical plane by engagement of a notched lug P with a portion of the adjacent partition plate H which has a shoulder h to limit upward movement of the lever. This arm or lever has a series of steps or lugs 49 which cooperate respectively with the legs of the swinging stop plates, and at its forward portion has a series of steps or shoulders 4 which serve to definitely limit or prevent overthrow of the lever A. A spring 6 applied to the rear end of the stop arm or lever 4. tends to elevate its forward arm but is normally restrained by reason of engagement between astud 7 on the triangular lever B and a depending arm 4 of the lever l. The le of the link or bar I) to' which the link 2 is coupled is extended and formed with a laterally projecting lu (Z for cooperation with the steps or shoul ers 4".

In operation the depression of a key F results in singling out the leg 2 of the stop plate immediately tothe rear of that key so that said 1e 'controls'the movement of the stop lever 4 y reason of contact between the underlying lug or step 4 of said lever and the bottom edge of said leg, as illustrated in Fig; 2 where the 2 key is shown depressed. It will be understood of course that when the lever A moves down under actuation of the key the said stop lever 4 is released so that the sprin 6 lifts its front portion; The stopping of that lever 4 by contact of one of its steps 4 with one of the legs 2 locates the proper verticalfste or shoulder 4 in linewith the lug d o the link or bar D, sothat such. step or'shoulder v will definitely limit forward -movement of. said link or bar and thereby correctlymeas' u-re the movement of the gear segment-E;

' shown at 21 in order to or revent any overthrow thereof which mig it. result in incorrect registration.

There are eight of the vertical steps or shoulders 4c" and eight of the steps or lugs a on the lever 1-, to correspond with the keys numbered from 1 to 8. The 9 key requires part of the pivotal connection between the a triangular lever B and the bar D.

In the construction illustrated by Figs. 6 to 9 I dispense with the element of the long stop arm or lever with the eight vertical steps or shoulders, and arrange to have the swinging stop plates directly block forward movement of the link or bar which connects the triangular lever with the registering gear segment. That portion 20 of the swinging plate which functions to prevent simultaneous depression of keys is identical with the corresponding portion of the plates already described. The plate is yokeshaped after the manner of the plate previously described but the formation at the side opposite that where the portion :20 is located differs in order "to adapt it for cooperating directly with the link or bar D. The latter is of somewhat different form from the link D illustrated in Fig. 1. Thus it is of somewhat irregular form or contour longitudinally and it is formed with seven stop lugs d variously positioned along its upper edge and of differing dimensions, and

a single stop lug (Z on its under edge at the forward part. These stop lugs are designed to cooperate respectively with the righthand portions of the yoke-shaped stop plates. These portions of said plates are of varying longitudinal contour as illustrated in Fig. 6. Each, except the oneon the fore most plate, extends forwardly, being designated by the numeral 21, and at its forward extremity is turned laterally so as to form a stop lug 22 to cooperate with the corresponding stop lug. d. In the case of the foremost plate the arm designated 21 extends rearwardly but has a similar, terminal stop lug 22 to cooperate with thelug d on the underside of the bar D. The arm 21 of the next foremost plate runs past this arm 21 of the foremost plate as shown in F ig.. 6, and the latter 'is slightly offset as accommodate the other arm. A r

The displacement of stop plates 20 by depression of any one of the keys (except the 9 key which requires no special stop devices'for limiting movementof the lever A) in s'ingli lg'f'oilt the stop plate imme- .15 I relatively strong spring E It will of course be understood that the arm and segment are diately rear of the operated key so that the lug 22 of the arm of such plate will coact with the corresponding lug d? (0rd in' the case of the 1 key) to definitely and positively limit'the forward movement of the link D. v Thus in Fig. -7 the 2 key is shown depressed and the foremost lug d is illustrated-as in contact with the; lug 22 of the arm '21 of the plate 20 immediately in rear of said key.

' In the construction shown by Figs. 6 and 7 it will be noted that. the bar or link D does not connect directly with the gear segment E, but is'coup'led to an armE which arm-is connected to the gear segment by a independently journaled upon the frame cross rode, and the object is to prevent in- .jury to theregistering mechanism in case of its becoming obstructed 1 such event thespring E would yield to the force applied instriking a key.

. mI claim:

' lQThe combination of a vibratory actua a series of keys acting thereon, and a.- set of stops-relatively arranged to prevent tor,

depression of two keys at once and also serving to block movement of the actuator at actuator at the position to which it is set offs'winging one forv each key and displacea'ble to a 11msaid stops severallyv brought by a key.

3.;The -combination of vibratory actuator, aiserie's of stops arranged 1n tandem ited extent by the same,

or locked. In any restrained by link. keys acting thereon, and a serving to block movement'of the actuator at the position to which it is brought by a key.

' 4. The combination'of a lever, keys'actingj thereon at different distances from its pivot,

a link coupled to the lever for longitudinal movement thereby, and a set of stops relatively arranged ,to prevent-depression of two' keys at once and. also servingto'block movement of the aforesaid link at the difi'erent' positions it assumes under key action.

movement thereby, and a se't of swinging stops arranged in tandem one for each key and; displace-able to a limited extent by the same, said stops adapted. when displaced'to block the said link at the different positions it assumesunder key action. I

6. The combination of a lever, keys acting-thereon at different distances from its pivot, a swingingstep'ped stop-arm normally the lever, and a series of overthroW-preventing stops, one breach y adapted to variously limit the movement. of

The combination of a lever, keys acting "thereon at different distances from its pivot, a link coupled to the lever for longitudinal.

said stop-arm-wherebyto set one or another.

of its steps or shoulders in, position f or blocking movement of: the lever.

7. The combinationof a lever, keys acting thereon at difierent distances from its pivot, aswinging stepped stop-arm normally restrained by the lever, a link coupled to the lever for longitudinal movement thereby,

and a series of overthrow-preventing stops,

one for each,key, adapted to variously limit movement of said stoprarm whereby toset one or another of its steps or shoulders n position for blocking movement'of the said ALLEN'A. HORTON. Witnesses:

J. A. Bnornv, Enmnsr-Biacm 

